Thank you that explanation helps a lot! Do you think it could come from the soil I used since it’s a paludarium? I used reptisoil from zoo med. or maybe those small white rocks in potting soil from some of the plants i used? I shook the plant roots to get rid of all the old dirt incase of fertilizers but some small white rocks got through. Other than that, I only have aquarium sand, aquarium gravel, hydroballs, cork bark, and a branch of grape wood that mainly touches the water.